More males than females are born (about 105 boys for every girl) and also conceived (140-160 males conceived for every 100 females).

Fewer males than females survive to adulthood. This is for a variety of reasons, including increased rates of illness and vastly higher rates of interpersonal violence, up to and including wars.

Of the males that survive to adulthood, fewer have offspring compared to females. Of all the males that have ever lived, only 40% of them have surviving offspring. Whereas of all the females who have ever lived, 80% of them have surviving offspring.

All throughout human history, and in fact amongst most mammals, it is a very typical occurrence for a conqueror or new “alpha” male to take over and kill off or drive away many or all the men and male offspring that may have been fathered by another individual or tribe. There are thousands of examples of this throughout human history dating back to the earliest myths and legends and it’s also very common amongst our closest animal relatives, the primates.

Even though males are on average less reproductively successful, some males are SUPER successful and are able to pass down genes to many offspring. An example is Genghis Khan, whose genes are carried by an estimated 8% of all Asian males.

Even though females are on average more reproductively successful than males, even the most successful female reproducers are biologically unable to have as many offspring as the most successful male reproducers are.

Genes are passed down from generation to generation. Those that are successful are passed down to successive generations and those that are less successful, die out.

It makes NO sense for a family to “only make boys”. A family that “only made boys” would be tying their entire genome to a gender that starts out life more likely to die from the moment of conception onward, has on average far less chance at reproduction than females do, and runs the risk of being completely wiped off the face of the planet at any moment – the first time Genghis Khan comes to town and kills off all the males, that’s it, game over. No more offspring. Those genes would have died out a long time ago.

It makes NO sense for a family to “only make girls”. A family that “only made girls” would be tying their entire genome to a gender that is less likely to be conceived in the first place, cannot have as many children as males are able to start out with, and are unable to capitalize on extreme situations where one individual (such as Genghis Khan) is able to produce vast numbers of offspring (or even less vast like these guys The 20 Biggest Illegitimate Fathers In Sports | Bleacher Report)

It makes the most sense for individuals to have the gender of offspring that has the best chance of survival to adulthood to pass down genes Understanding the Trivers Willard Hypothesis. Thus, because “only making boys/girls” does NOT make sense, and being able to alter the gender of your offspring on a case by case basis does make sense, it’s far more likely that all humans have the ability to alter the gender ratio of their offspring on a case by case basis.

It is all but impossible for such a gene to have evolved anyway because if it did, the gender ratio would start to become so skewed within only a few generations, that it would become a huge disadvantage and start to become selected against. This idea, called “Fisher’s Principle” has actually been investigated by many scientists for over a century and has been proven in a series of simulations to be true. Regardless of what gender you start out with, the following happens:

Suppose male births are less common than female.
A newborn male then has better mating prospects than a newborn female, and therefore can expect to have more offspring. Therefore parents genetically disposed to produce males tend to have more than average numbers of grandchildren born to them. Therefore the genes for male-producing tendencies spread, and male births become more common. As the 1:1 sex ratio is approached, the advantage associated with producing males dies away.
The same reasoning holds if females are substituted for males throughout. Therefore 1:1 is the equilibrium ratio.

EVERY time that someone has come to me with incontrovertible proof that their family “only makes boys/girls” for 1 or 2 or 3 or 1 zillion generations, upon further investigation, there is invariably some branch of the family that is left out (well…except for the cousins), or “it skips a generation” or “only one girl per generation” or so on and so forth. These things simply don’t work and are and are the efforts of people to keep some half-baked theory going. Do some families seem to have more of one gender than another – YES, they do. But it isn’t genetics, it isn’t set in stone, and says nothing about YOUR chances of having a girl or a boy!!!

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